Abstract: A register boot adapted for connection to ductwork and in a ducted heating or cooling system and has a unitary body of plastic. The unitary body has a substantially circular first opening for connecting to ductwork. The unitary body has a substantially rectangular second opening for connection to a register. The unitary body defines an air pathway between the first opening and the second opening. The unitary body preferably includes a first collar of a first diameter operatively connection to a second collar of a second diameter defining the first opening, the first diameter being greater than the second diameter. A fitting with the first and second collar is also disclosed. The fitting can be a register boot, flexible joint, or other type of fitting.

Abstract: A complete plastic HVAC system assembled using individual plastic components for ensuring the efficient and quiet distribution of air from a central air unit to multiple distribution points and preventing heating and cooling losses, the need for installers to stock multiple sized and shaped components, the accumulation of dust, dirt and pollens during storing, installing and use on the surfaces of the individual components. The fittings have a collar sizable to fit both 6 and 7-inch pipe, whether flexible or rigid. The use of plastic fittings, duct and pipe removes the potential of injury commonly associated with conventional metal ductwork, while providing seamless components that can be configured for any type of installation and insure an air tight connection between adjoining surfaces. The individual fittings include a register boot, torpedo boot, straight boot, rigid and flexible pipe and couplers, straight and 90-degree takeoffs, a plastic duct and duct end cap.